Guard for platen printing-presses.



J. FABRAR.

GUARD FOB PLATE! PRINTING PRESSES. urmoulol nu :un: aa,19os.

927,226. Patented `July 6,'1909.

UNITED sTATias 'PATENT OFFICE.

JOHN FARRAR, or Leens, ENGLAND.

GUARD FOB PLATEN PRINTING-RESSES.

Specification of Letteral Patent.

Patented .Tuly 6, 1909. t

Application med June 23, 1908. Serial No. 439,931.

Presses, of which the following is a specifica` tion.

In feeding platen printing presses, accidents frequently happen to. theattendants who through carelessness or otherwise, fail to lift the handsbefore the platen reaches the type bed; and with a 'view to preventingsucliaccidents, various -contrivances, such as hinged flaps and pivotedguards, have hitherto been provided wherein the motion of the platen iscaused to operate said contrivances to automatically thrust lup the handout of the way.

N ow this invention refers to an improved guard of the pivoted type ashereinafter described, which is operated by the motion ofthe platen insuch a manner as to cause the said guard to have a movement reater andso as to act more efficiently t an guards hitherto employed; while atthe same time, the construction of the guard is. such as to enable it tobe produced at a cheap cost and also capable of bein readily applied toany press in which the p aten swings to and from a` type bed. p

According to this invention I employ -a frame which is mounted over thefree edge of the platen and securely attached to .the opposite sidesthereof, said frame being formed with upstanding lu s carrying ahorizontal shaft provided witi a tilting plate, which latter, when theplaten is in the open position, lies in the same plane as the platen.The shaft which carries the tilting plate is pro'ected outward beyondone end of the sai plate, and on the projecting portion of the s aft ismounted a chain wheel. To this chain wheel, one end of a chain iSsuitably attached and the other end of the chain is connected to a studprovided on the frame of the machine, the parts being so connected thatduring the time the platen is moving toward the type bed, the chain hasthe effect of partially rotating the chain wheel and its shaft, so as toraise or rotate the tilting plate from its normal position throughapproximately a half revolution against the liaiid of the attendantwhich is thus automatically thrust or lifted Aout of the wa of theclosing platen,

and on the shaft of t ie tilting plate, l cml ploy a spring or othersimilar means adapted in the return movement of the platen to positionwhen it is in substantially the same plane as fthe platen.

In-the drawing, Figure 1 is a side elevation illustrating my improvedguard for platen printing presses and Fig. 2 is a plan of the same.

Referring particularly to the drawing, I emplol a frame 1 which ismounted over the free ei g tothe opposite sides thereof by screws 3, andthisframe 1 is formed with opstanding lugs 4 which carry a horizontalshaft 5 to which is connected a tilting plate 6. This tilting -move thetilting late in the reverse directionl 4so as to bring t e same back toits normal e of a platen 2 and securely attached plate 6 when the platen2 is in its open position, lies in the same lane as the platen `and theshaft 5 is provi ed at one end with a chain wheel 7 connected to ,whichin any suitable place and in any suitable manner, is a chain 8, theopposite end of the chain 8 being connected to a stud 9 provided on theframe 11 of the press,.12 indicating a shaft also mounted' in the frameof the machine and upon which the (platen 2 swings.

0n the shaft 5 an preferably adjacent to the chain wheel 7 I employ ahelical spring 16 so connected' to the moving parts as to normally.maintain the tilting plate 6 in its 4normal position substantially inthe same return movement of the laten, the spring f 16 will operata toreturn t e its normal position. I claim as my invention: In pivotedguards for platen` printing presses, the combination. with -a swiplaten, of a frame extending outwardly an over the free ed e of thelaten, a `shaft mounted insaid ame, a t' ting plate connected to saidshaft and extending downtilting plate to wardly within said frame so asto normally lie in the saine plane as' the platen, a chain whccl onsiiidsliaft, a chain attached thereto and to the franic of the machinefor partially rotating the shaft automatically when the platen movestoward the type bed so as to 1n witness whereof l have hereunto set myraise o1 rotate the tilting plate through about hand in the presenve oftwo witnesses. one-he1f e revolution and a sp1-i110' on said i l; w 1shaft for rotetmg 1t ehtonmueally 1n the re- K I Ahh/XH 5 Versedirection on the return movement of Witnesses:

the platen so es to return the tlltlng plete to JonN J WE'1"1,

its nornml position. 'VANen IC. (ALlAnv/n'.

